How is the foreign UID mapped in samba?
The foreign UID/GID is mapped from allocated ranges (idmap uid and idmap gid) in precisely the same manner as when using winbind with a local IDMAP table. The nss_ldap tool set can be used to access UIDs and GIDs via LDAP as well as via Active Directory.
How to set the uidnumber attribute in samba?
You need to set the uidNumber attribute to access samba shares on a domain with the Windows machine network account. Open ADUC. Right-click to a computer account and choose properties. Navigate to the “Attribute Editor” tab. Note: If you don’t see this tab, you haven’t installed the RSAT function “Server for NIS Tools”.
How is samba used as a domain controller?
When Samba is used as a domain controller, it provides a method of producing a unique SID for each user and group. Samba generates a machine and a domain SID to which it adds an RID that is calculated algorithmically from a base value that can be specified in the smb.conffile, plus twice (2x) the UID or GID.
Can a Samba server use only local accounts?
Samba can be configured to use only local accounts, in which case the scope of the IDMAP problem is somewhat reduced. This works reasonably well if the servers belong to a single domain, and interdomain trusts are not needed.
Why is it important to use idmap in samba?
The use of IDMAP is important where the Samba server will be accessed by workstations or servers from more than one domain, in which case it is important to run winbind so it can handle the resolution (ID mapping) of foreign SIDs to local UNIX UIDs and GIDs. The use of the IDMAP facility requires the execution of the winbinddupon Samba startup.
What is the algorithmic mapping method in samba?
Samba generates a machine and a domain SID to which it adds an RID that is calculated algorithmically from a base value that can be specified in the smb.conffile, plus twice (2x) the UID or GID. This method is called “algorithmic mapping”.
How are SIDS allocated in winbind Samba server?
The SIDs are allocated a UID/GID in the order in which winbind receives them. This configuration is not convenient or practical in sites that have more than one Samba server and that require the same UID or GID for the same user or group across all servers.